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Publication date: Jun 16, 2022
The interest in magnetic nanostructures exhibiting perpendicular magnetic anisotropy and ex-change bias effect has increased in recent years owing to their applications in a new generation of spintronic devices that combine several functionalities. We present a nanofabrication process used to induce perpendicular magnetic anisotropy and exchange bias. 30-nm-thick CoO/Co multilayers were deposited on nanostructured alumina templates with a broad range of pore diameters, 34 nm ≤ Dp ≤ 96 nm, while maintaining the hexagonal lattice parameter at 107 nm. Increase of both the exchange bias field (HEB) and the coercivity (HC) (12 times and 27 times, respectively) was ob-served in the nanostructured films compared to the non-patterned film. The marked dependence of HEB and HC with antidot hole diameters pinpoints to an in-plane to out-of-plane changeover of the magnetic anisotropy at a nanohole diameter of ∼ 75 nm. Micromagnetic simulation shows the existence of antiferromagnetic layers that generate an exceptional magnetic configuration around the holes, named as antivortex-state. This configuration is responsible of inducing extra high-energy superdomain walls for samples with edge-to-edge distance (W) >> 27 nm and high-energy stripe magnetic domains for W < 27 nm, responsible of the perpendicular magnetic signal of the samples.
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Fig2.dat
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15.2 KiB | X-ray reflectivity experimental data (open circles) and simulation (red line) of the Glass/Pd/[CoO/Co]x7/Pd ML. Plain text |
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Fig3a).dat
MD5md5:f9b63b3ce599e55b4931909ab5fcdf7d
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208.0 KiB | In-plane MOKE hysteresis loops for the non-patterned and antidot CoO/Co ML samples with different hole diameters at room temperature. Plain text |
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Fig3b).dat
MD5md5:b44475c51b23b8e54dd1800970b6d7ca
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113.6 KiB | Out-of-the-plane MOKE hysteresis loops for the non-patterned and antidot CoO/Co ML samples with different hole diameters at room temperature. Plain text |
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Fig4.dat
MD5md5:3b2a598106c8ebc3ad0c15890c9af238
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128 Bytes | Room temperature coercivity measured along the out-of-the plane and in-plane directions for the antidot CoO/Co ML as a function of antidot hole diameter. Plain text |
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Fig5-INP.dat
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40.5 KiB | In-plane of M(H) curves measured at 60 K after field cooling (Hcool = 20 kOe) for the CoO/Co MLs with different hole diameters. Plain text |
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Fig5-OOP.dat
MD5md5:29ec0bc9ed429fc99a6e5a31f87edd81
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49.7 KiB | Out-of-the-plane of M(H) curves measured at 60 K after field cooling (Hcool = 20 kOe) for the CoO/Co MLs with different hole diameters. Plain text |
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figure9.png
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518.9 KiB | Micromagnetic simulation of the OOP magnetic domain structure of Co1, CoO1, Co2, and CoO2 nanostructured layers with W = 76 nm and fixed lattice parameter P = 108 nm at the remanence state. PNG format. |
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figure11.png
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410.1 KiB | Micromagnetic simulation of the OOP magnetic domain structure of Co1, CoO1, Co2, and CoO2 nanostructured layers with W = 14 nm and fixed lattice parameter P = 108 nm at the remanence state. PNG format. |
| 2022.80 (version v1) [This version] | Jun 16, 2022 | DOI10.24435/materialscloud:jg-e7 |
